Anti-drug antibodies in 3/22 monkeys (13.6%), affecting serum concentration in one
“Antibody responses were observed in 3/22 (13.6%) Cynomolgus monkeys. An effect on cetuximab serum concentrations was observed for one of these animals only.”
Saturable clearance at higher doses; distribution mainly within plasma volume
“Clearance decreased and terminal half-life increased with increasing dose, indicating a saturated clearance at higher doses. Distribution volume indicated that cetuximab is mainly located in the plasma volume.”
Antibodies in 3/22 monkeys (13.6%); effect on serum cetuximab in one animal
“Antibody responses were observed in 3/22 (13.6%) Cynomolgus monkeys. An effect on cetuximab serum concentrations was observed for one of these animals only.”
Binding anti-cetuximab antibodies <5% of 105 evaluable patients (ELISA)
“The incidence of anti-cetuximab binding antibodies in 105 patients (from studies I4E-MC-JXBA, I4E-MC-JXBB, and I4E-MC-JXBD) with at least one post-baseline blood sample (≥4 weeks post first ERBITUX administration) was <5%.”
In vitro whole-blood cytokine release far below alemtuzumab/TGN1412 controls; no effects on monkey TDAR, lymphocyte subsets or serum cytokines; ADA in some monkeys